Septum

A septum (Latin: something that encloses; plural Septa) is a partition separating two cavities or spaces. Examples include:

• Nasal Septum: the cartilage wall separating the nostrils of the human nose.Often deviated or perforated through physical injury or cocaine abuse.
• Cephalopod Septa: walls between each chamber, or siphuncle, in shells of nautiloids, ammonites, and belemnites; i.e. cephalopods that retain an external shell.
• The wall dividing the right side of the heart from the left side.

Fungi produce septa to partition filamentous hyphae into discrete cells.

Septum Media

• 

  the diagram shows a healthy heart and one suffering from ventricular septal defect.

• 

  Bronchial anatomy detail of alveoli and lung circulation

• 

  Septins in Saccharomyces cerevisiae

• 

  Septate hyphae of the fungus Alternaria, showing the septa between individual cells

• 

  A tomato has septa that divide the fruit into chambers (locules) that contain the seeds.